The Iroquois were primarily planters, but supplementing their cultivation of maize, squash, and beans with fishing and hunting. A but supplementing B. and had supplemented C. and even though they supplemented D although they supplemented E but with supplementing 答案是D. 解释中说supplementing只能describle or extend前面部分的meaning但是句子本意想要表达的是contrast。我不是很明白为什么,A和D的逻辑意思的差别在哪里呢?